Description of problem: When one uses the drag-and-drop function (for example for a text passage) in Firefox and meanwhile uses Alt + Tab to switch to another program, it is not possible to use the cursor for clicking anymore (clicking in the Gnome shell works, though). To make the mouse cursor work again, it is necessary to return to Firefox and press the Enter or Space key. Version-Release number of selected component (if applicable): 51.0.1 How reproducible: Steps to Reproduce: 1. Open Firefox and use the drag-and-drop function somewhere, for example for a text passage. 2. While dragging switch to another program with Alt + Tab 3. Now it is impossible to click somewhere with the mouse cursor and the text passage one tried to drag-and-drop is also displayed in the other program. Actual results: Unable to click with the mouse cursor in any program (in the Gnome shell it is working though). Expected results: Mouse cursor keeps working.
Thunderbird is also showing the same bug. Except those two programs, using drag-and-drop while switching programs works just fine.
Hm, I cannot reproduce in Xorg session, only Wayland.
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